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x in (-oo:+oo)
-(x*((-3*x-(5*y))/4))-(x*((4*x+9*y)/4)) = 0
-(x*((-3*x-5*y)/4))-(x*((4*x+9*y)/4)) = 0
(-1*x*(-3*x-5*y))/4+(-1*x*(4*x+9*y))/4 = 0
-1*x*(-3*x-5*y)-1*x*(4*x+9*y) = 0
-x^2-4*x*y = 0
-x^2-4*x*y = 0
-x*(x+4*y) = 0
x+4*y = 0 // - 4*y
x = -(4*y)
x = -4*y
-x*(x+4*y) = 0
(-x*(x+4*y))/4 = 0
(-x*(x+4*y))/4 = 0 // * 4
-x*(x+4*y) = 0
( -x )
-1*x = 0 // : -1
x = 0
( x+4*y )
x+4*y = 0 // - 4*y
x = -(4*y)
x = -4*y
x in { 0, -4*y }
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